Which rack-mounted hardware firewall would you buy on a budget (preferably from eBay)? After spending quite a bit of cash on a new rack enclosure, servers, switch gear, and cabling for my home office, I've gone way over budget. I need a hardware based firewall and am looking to eBay. Unfortunately, I've been using SonicWall gear for so long that all others are foreign to me. And, unfortunately again, most SonicWall devices you see on eBay have been used in their "trade up" program and are no longer usable.